--- product_id: 408709763 title: "New Leak Down Tester Tu-21 Engine Cylinder Leak Tester Leakage Detector Engine Compression Tester Gauges Set" brand: "ondy" price: "€ 171.53" currency: EUR in_stock: true url: https://www.desertcart.be/products/408709763-new-leak-down-tester-tu-21-engine-cylinder-leak-tester store_origin: BE region: Belgium --- # Fits 4-stroke gasoline engines Accurate cylinder leak down measurement Compatible with 10/12/14mm spark plugs New Leak Down Tester Tu-21 Engine Cylinder Leak Tester Leakage Detector Engine Compression Tester Gauges Set **Brand:** ondy **Price:** € 171.53 **Availability:** ✅ In Stock ## Summary > 🔍 Diagnose like a pro, drive with confidence! ## Quick Answers - **What is this?** New Leak Down Tester Tu-21 Engine Cylinder Leak Tester Leakage Detector Engine Compression Tester Gauges Set by ondy - **How much does it cost?** € 171.53 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/408709763-new-leak-down-tester-tu-21-engine-cylinder-leak-tester) ## Best For - ondy enthusiasts ## Why This Product - Trusted ondy brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **User-Friendly Setup:** Simple installation with clear gauge calibration and audible leak detection for quick diagnostics. - • **Compact & Durable Design:** Lightweight 1.42 kg build with robust USA-made quality, perfect for tight engine spaces. - • **Precision Leak Detection:** Pinpoints engine faults like worn rings, valves, cracks, and blown head gaskets with high accuracy. - • **Side-by-Side Cylinder Comparison:** Easily compare suspect cylinders against healthy ones to diagnose issues faster. - • **Universal Spark Plug Compatibility:** Works seamlessly with 10, 12, or 14mm spark plugs for broad vehicle coverage. ## Overview The ONDY TU-21 Leak Down Tester is a precision engine diagnostic tool designed for gasoline 4-stroke engines with 10, 12, or 14mm spark plugs. It accurately measures cylinder leakage to identify common engine issues such as worn piston rings, valves, cracks, and blown head gaskets. Lightweight and compact, it offers easy setup and side-by-side cylinder comparison, making it ideal for professional mechanics and serious car enthusiasts aiming to maintain peak engine performance. ## Description New Leak Down Tester Tu-21 Engine Cylinder Leak Tester Leakage Detector Engine Compression Tester Gauges Set ## Features - FITS YOUR VEHICLE -- It is compatible with gasoline 4-stroke engines and 12mm or 14mm spark. As long your vehicle has a standard spark plug socket, this set will work for you. - COMPARE CYLINDERS -- It best tests cylinder leak down and compression when comparing a suspect cylinder to a known good cylinder on the same engine. - EASY TO USE -- Remove the Schrader valve and turn the regulator off before applying shop air. Install the hose to the cylinder, the unit to an air supply, calibrate the leak gauge, and connect the unit to the cylinder hose. Diagnosis is made by observing the amount of leakage indicated on the cylinder leakage gauge and listening for leakage at various points of the car system. - Designed to detect a variety of common engine faults. including: Worn piston rings, worn valves, cracks in cylinder walls and blown head gaskets. - Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs. Tester checks the amount of leakage in an engine cylinder & helps determine the source. Ideal for testing trucks & late model cars where clearance is minimal. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | ONDY | | Country of Origin | USA | | Item part number | 29-0629 | | Product Dimensions | 30 x 30 x 5 cm; 1.42 kg | | ASIN | B08225M7VC | ## Product Details - **Brand:** ONDY - **Material:** Carbon steel - **Item dimensions L x W x H:** 30 x 30 x 5 Centimeters - **UPC:** 016071508109 - **Manufacturer:** ONDY ## Images ![New Leak Down Tester Tu-21 Engine Cylinder Leak Tester Leakage Detector Engine Compression Tester Gauges Set - Image 1](https://m.media-amazon.com/images/I/81hp0zGvQsL.jpg) ## Questions & Answers **Q: This says for compression and leak test. compression testing requires a gauge to at least 180 psi but gauge shown is far less. is picture wrong?** A: I would not use a leak down tester as a compression tester. A leak down test is very specific and gives complementary data to a compression test. If you want to do a compression test get the proper tool. When testing an engine of unknown quality I always do both tests since the testers are not expensive. **Q: Where is this made?** A: China **Q: Can anyone tell me if the attachments will fit down the spark plug well of bmw r1200 gs motorcycles, 2010-2012?** A: Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs. **Q: Will this work on a jeep 4.0l? (2000 grand cherokee wj)** A: Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs. Tester checks the amount of leakage in an engine cylinder & helps determine the source. Ideal for testing trucks & late model cars where clearance is minimal. ## Frequently Bought Together - New Leak Down Tester Tu-21 Engine Cylinder Leak Tester Leakage Detector Engine Compression Tester Gauges Set - BETOOLL HW0130 8pcs Petrol Engine Cylinder Compression Tester Kit Automotive Tool Gauge --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/408709763-new-leak-down-tester-tu-21-engine-cylinder-leak-tester](https://www.desertcart.be/products/408709763-new-leak-down-tester-tu-21-engine-cylinder-leak-tester) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-10-18*